EP1027284A1 - Synthese de sapo-44 - Google Patents

Synthese de sapo-44

Info

Publication number
EP1027284A1
EP1027284A1 EP98952060A EP98952060A EP1027284A1 EP 1027284 A1 EP1027284 A1 EP 1027284A1 EP 98952060 A EP98952060 A EP 98952060A EP 98952060 A EP98952060 A EP 98952060A EP 1027284 A1 EP1027284 A1 EP 1027284A1
Authority
EP
European Patent Office
Prior art keywords
range
mixture
aluminum
component
reaction product
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98952060A
Other languages
German (de)
English (en)
Inventor
Zhongmin Liu
Xiexian Di Guo
Guangyu Cai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ExxonMobil Chemical Patents Inc
Original Assignee
Exxon Chemical Patents Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Exxon Chemical Patents Inc filed Critical Exxon Chemical Patents Inc
Publication of EP1027284A1 publication Critical patent/EP1027284A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/82—Phosphates
    • B01J29/84—Aluminophosphates containing other elements, e.g. metals, boron
    • B01J29/85—Silicoaluminophosphates [SAPO compounds]
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B37/00—Compounds having molecular sieve properties but not having base-exchange properties
    • C01B37/06—Aluminophosphates containing other elements, e.g. metals, boron
    • C01B37/08—Silicoaluminophosphates [SAPO compounds], e.g. CoSAPO
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S423/00—Chemistry of inorganic compounds
    • Y10S423/30—Alpo and sapo

Definitions

  • the present invention relates to a method of synthesizing a molecular sieve
  • SAPO-44 silicoaluminophosphate 44
  • Light olefins defined herein as ethylene propylene, butenes and mixtures
  • olefins traditionally are produced by petroleum cracking. Due to the escalating cost of
  • feedstocks are oxygenates, such as alcohols, particularly methanol, dimethyl ether,
  • Alcohols may be produced by fermentation, or from
  • hydrocarbons having molecular weights heavier than butane or low-valued by ⁇ having molecular weights heavier than butane or low-valued by ⁇
  • zeolitic zeolites — or non-zeolitic.
  • zeolite A zeolite A
  • zeolite X zeolite X
  • zeolite Y zeolite Y
  • ZSM-5 zeolite Y
  • ZSM-34 erionite
  • chabazite chabazite
  • non-zeolitic molecular sieves particularly silicoaluminophosphates
  • SAPO's have been synthesized and investigated as catalysts for converting
  • SAPO's have a three-dimensional microporous crystalline framework of PO 2 + ,
  • AlO 2 ⁇ and SiO 2 tetrahedral units Because an aluminophosphate (AlPO 4 ) framework
  • silicon atoms incorporated into an AlPO 4 framework is important in determining the
  • the catalytic properties of a SAPO catalyst also can be modified after the
  • SAPO molecular sieve has been synthesized. This type of "post-synthesis"
  • modifiers may or may not become part of the final composition of the
  • SAPO's suitable for converting the oxygenates to light olefins include SAPO-
  • SAPO- 18, SAPO-34 and SAPO-44 are small-pore molecular sieves with pore diameter smaller than about 5 Angstroms. Small pores are believed to favor light
  • SAPO-44 molecular sieves it may be possible to incorporate more silicon atoms into
  • the starting materials were aqueous silica sol, aluminum isopropoxide,
  • the SAPO-44 was obtained as the "major phase" in
  • SAPO-44 can be used as a catalyst for the hydrocarbon cracking
  • SAPO-44 from cheaper starting materials and/or under less demanding
  • HF hydrofluoric acid
  • the present invention provides a method which comprises forming a mixture comprising a silicon component; an organic template at a first molar ratio of greater
  • the present invention provides a method of making a molecular sieve catalyst
  • SAPO-44 silicoaluminophosphate 44
  • the method generally comprises forming a mixture comprising a silicon
  • hydrothermal treatment may be calcined further at an elevated temperature.
  • the molecular sieve product may be any suitable molecular sieve material.
  • molecular sieve consisting essentially of pure SAPO-44.
  • silicon compounds and their mixtures may be used as the silicon
  • the silicon compounds include,
  • silica sol but are not limited to silica sol, silica gel, colloidal silica, fumed silica, silicic acid,
  • preferred silicon component comprises a material selected from the group consisting of silica sol, silica gel, colloidal silica, fumed silica, silicic acid, and mixtures thereof.
  • the aluminum compounds include,
  • aluminum hydroxy chloride aluminum alkoxides such as aluminum tri-isopropoxide,
  • a preferred aluminum component comprises a material selected
  • boehmite and pseudo boehmite are from the group consisting of boehmite and pseudo boehmite. These compounds can be selected from the group consisting of boehmite and pseudo boehmite. These compounds can be selected from the group consisting of boehmite and pseudo boehmite. These compounds can be selected from the group consisting of boehmite and pseudo boehmite. These compounds can be selected from the group consisting of boehmite and pseudo boehmite. These compounds can be selected from the group consisting of boehmite and pseudo boehmite. These compounds can be selected from the group consisting of boehmite and pseudo boehmite. These compounds can be selected from the group consisting of boehmite and pseudo boehmite. These compounds can be selected from the group consisting of boehmite and pseudo boehmite. These compounds can be selected from the group consisting of boehmite and pseudo boehmite. These compounds can be selected from
  • phosphorus component comprises orthophosphoric acid (H 3 PO 4 ). Another preferred
  • phosphorus component comprises the commercially available 85 wt% phosphoric acid
  • phosphorus oxides (P 2 O 3 , P 2 O 4 , P 2 O 5 , and POCl 3 ) may be
  • phosphorus compounds can be purchased from companies such as Aldrich Chemical
  • a suitable organic template comprises a material selected from the group consisting of:
  • preferred organic template comprises cyclohexylamine (CHA).
  • CHA cyclohexylamine
  • template comprises a material selected from the group consisting of
  • organic templates can be any organic templates, including but not limited to, butylammonium salts, and mixtures thereof.
  • the organic templates can be
  • a solvent can be mixed with the organic template before the template is added
  • the organic template is completely miscible with,
  • Suitable solvents include but are not necessarily limited to
  • the aluminum component and the phosphorus are mixed in a suitable solvent
  • template may be combined to form a second mixture of uniform composition
  • reaction mixture excluding any other organic or inorganic moieties or species which
  • T a Si w ALP y O z -bH 2 O wherein T represents the organic template.
  • the molar ratio of the organic template to aluminum, a/x is in the range of
  • template to phosphorus, a/y is in the range of from about 1 to about 5, preferably
  • the molar ratio of the template to silicon, a/w, is in the
  • ratio of phosphorus to aluminum, y/x is in the range from about 1 to about 0.2.
  • molar ratio of the template to water , a/b is in the range from about 0.02 to about 0.2,
  • ammonia/ammonium hydroxide to increase the pH, or an appropriate amount of a suitable inorganic or organic acid such as phosphoric acid, HC1, acetic acid,
  • composition gradient should be minimized because such a gradient could result in the
  • a constant temperature is maintained during the preparation of the
  • Cooling or heating may be required to provide a constant temperature environment.
  • suitable temperature for preparation of a mixture is in the range of from about 10°C to
  • parameters such as pH, temperature, or concentration.
  • the mixture optionally may be aged for a certain period of time.
  • the mixture usually is placed in a metallic autoclave which
  • plastic walls also may be used as long as the wall material does not react with the
  • reaction mixture With or without agitation/stirring, the mixture is heated to a
  • required time period depends on the temperature and composition of the mixture.
  • An autogenic pressure usually is maintained. If preferred, a non-reactive gas
  • CO is another gas that may be used unless CO undesirably reacts with the mixture or
  • the recovered product preferably is dried at
  • a suitable pressure is in the
  • the recovered product preferably is calcined to
  • the calcination is carried out at a temperature in the
  • Non-oxidizing atmospheres also may be used, including but not necessarily limited to nitrogen, hydrogen, water (steam) and
  • the time period for the calcination is in the range of from about 30
  • Controlled ion-exchange also can be carried out to
  • Catalysts made according to the present invention can be used to convert
  • Oxygenates can be converted to olefins by contacting an oxygenate feed with a
  • light olefins such as ethylene, propylene, butenes, and mixtures thereof.
  • Oxygenates suitable for use in the feed include, but are not necessarily limited
  • oxygenates are methanol, ethanol, n-propanol, isopropanol, n-
  • a temperature in the range from about 200 °C to about 800°C a pressure in the range of from about 1 kPa to about 2 MPa; a
  • Weight Hourly Space Velocity in the range of from about 0.01 to about
  • the feed may contain diluents and the catalyst may contain filler
  • WHSV is calculated on the weight of the oxygenate feed
  • Suitable diluents include but
  • the oxygenate feed is contacted with the catalyst in a conversion reactor under
  • a suitable conversion reactor is a fixed bed
  • Unreacted feedstock may be recycled back to
  • the conversion reactor or otherwise disposed. If the catalyst is deactivated, it is
  • Regeneration can be carried out in the conversion reactor itself, or in a
  • Regeneration usually is carried out at an elevated
  • Catalysts of the present invention also can be used for conversion of relatively
  • hydrocarbon feedstocks include, but are not necessarily limited to
  • the feedstocks preferably comprise mostly non-
  • Preferred products comprise
  • light olefins ethylene, propylene, butenes, and mixtures thereof.
  • WHSV weight hourly space velocity
  • the feed may contain diluents and the catalyst may contain filler
  • WHSV is calculated on the weight of the hydrocarbon feed
  • feedstocks The amounts of diluents used are in the range of from about 0 wt% to
  • the hydrocarbon feed is contacted with the catalyst in a conversion reactor
  • a suitable conversion reactor is a fixed bed
  • reactor a moving bed reactor, a fluidized bed reactor, or other similar types of reactor.
  • Regeneration can be carried out in the conversion reactor or in a separate regeneration
  • Regeneration usually is carried out at an elevated temperature, in the range of
  • a reaction mixture was prepared by mixing 11.53 g of 85 wt%
  • boehmite (74.2 wt% alumina and 25.8 wt% water) with adequate stirring to make the
  • silica gel 26 wt% SiO 2 , 74wt% H 2 O
  • reaction mixture was sealed in a 100 ml stainless steel vessel and heated in an oven at
  • the Al 2 O 3 : P 2 O 5 : SiO 2 molar ratio in the product was about: 1 : 0.74 : 0.92.
  • Si(4Al) means that the silicon atom
  • Si(OAl), zero such Al-O- groups
  • WHSV weight hourly space velocity
  • SAPO-44 could be prepared according to the method of the present invention.
  • molecular sieves are capable of converting methanol to light olefins in high

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)
  • Catalysts (AREA)

Abstract

On décrit un procédé de fabrication de cribles moléculaires comprenant un silicoaluminophosphate 44 (SAPO-44) ou un SAPO-44 sensiblement pur, et un procédé d'utilisation des cribles moléculaires ainsi préparés pour réaliser des transformations oxygénées en oléfines.
EP98952060A 1997-10-14 1998-10-02 Synthese de sapo-44 Withdrawn EP1027284A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/949,802 US6162415A (en) 1997-10-14 1997-10-14 Synthesis of SAPO-44
US949802 1997-10-14
PCT/US1998/020872 WO1999019254A1 (fr) 1997-10-14 1998-10-02 Synthese de sapo-44

Publications (1)

Publication Number Publication Date
EP1027284A1 true EP1027284A1 (fr) 2000-08-16

Family

ID=25489554

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98952060A Withdrawn EP1027284A1 (fr) 1997-10-14 1998-10-02 Synthese de sapo-44

Country Status (6)

Country Link
US (2) US6162415A (fr)
EP (1) EP1027284A1 (fr)
CN (1) CN1278780A (fr)
AU (1) AU9785098A (fr)
NO (1) NO20001950L (fr)
WO (1) WO1999019254A1 (fr)

Families Citing this family (81)

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NO20001950L (no) 2000-06-09
US6319487B1 (en) 2001-11-20
CN1278780A (zh) 2001-01-03
NO20001950D0 (no) 2000-04-13
WO1999019254A1 (fr) 1999-04-22
AU9785098A (en) 1999-05-03

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